RU2277333C1 - Method for protection of vegetative sunflower plants from damage action of 2,4-d - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: claimed method includes plant treatment with 3-amino-2-[N-(4-fluorophenyl)carbamido]-4,6-dimethyltieno-[2,3b]-pyridine in amount of 200 g/hectare over 5 days after herbicide application to protect vegetative sunflower plants from damage action of 2,4-dichlorophenoxyacetic acid butyl ester.

EFFECT: increased plant productivity.

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Description

The invention relates to a technology for the protection of cultivated plants from the damaging effects of herbicides.

A known method of protecting vegetative crops from the damaging effects of herbicides, providing for their treatment with an antidote after using the herbicide (Pitina M.R. et al., The current level and promising areas of crop protection from undesirable effects of the use of herbicides // Agrochemistry, 1986, No. 4, p. 107-136).

The objective of the invention is to expand the arsenal of antidotes of sunflower from the damaging effects of 2,4-D.

The technical result of the invention is the protection of vegetative sunflower plants from the damaging effects of 2,4-D, which is expressed in an increase in yield compared to a herbicide-treated control.

This result is achieved by the fact that in the method for protecting vegetative sunflower plants from the damaging effects of 2,4-D, comprising treating them with an antidote after using the herbicide, 3-amino-2- [N- (4-fluorophenyl) carbamido is used as an antidote ] -4,6-dimethylthieno [2,3-b] pyridine in an amount of 200 g / ha 5 days after using the herbicide.

The synthesis of the antidote was first carried out by the authors according to the scheme:

Synthesis technique.

A 3-cyano-4,6-dimethyl-2-pyridinethione K-salt was prepared by adding a solution of 0.56 g (10 mmol) KOH and 4 ml of water to 1.64 g (10 mmol) of the latter and 20 ml of dimethylformamide. To the resulting solution was added a solution of 1.73 g (10 mmol) of 4-fluorophenylchloroacetamide in 8 ml of dimethylformamide and stirred for 2 hours (TLC control until the starting compound disappeared). After that, a solution of 0.56 g of KOH in 4 ml of water was poured and kept for 1 h. The reaction mixture was diluted with 40 ml of water, the precipitate was filtered off, washed with water, and dried. After recrystallization from acetone, 2.46 g (78% of theory) of the target product with T _pl. = 192-193 ° C.

The antidote activity of the obtained compound in sunflower plants was evaluated in the experimental field of VNIIBZR. The known antidote 2,4-D, sulfalene, was used as a reference (List of pesticides and agrochemicals permitted for use in the Russian Federation. Appendix to the journal "Plant Protection and Quarantine", 2002, No. 6). The standard was used in the recommended amount for sunflower 200 g / ha at a flow rate of 300 l / ha. The tests were carried out according to the following procedure.

In the field, sunflower plants of the VNIIMK-8883 cultivar were treated with 2,4-dichlorophenoxyacetic acid butyl ether at a dose of 18 g / ha and after 5 days in a 10-16 leaf phase. applied a solution of the obtained compound at a dose of 200 g / ha with a flow rate of 300 l / ha.

In the experiment, the following options are provided:

1. Herbicide (control)

2. Herbicide + antidote (claimed)

3. Herbicide + antidote (standard)

4. Control (untreated plants)

The experiments were carried out on plots with an area of 3 m ² , five repetition. Harvesting of sunflower seeds was carried out at the time of complete ripening of seeds.

The antidote effect of the synthesized compound and the standard was determined by the absolute value of the addition to the herbicidal control and in percentage by the formula:

And _x is the antidote effect,%;

A - crop in the variant antidote + herbicide;

E - crop in the standard version (herbicide).

The data obtained are statistically processed using t - student criterion.

The test results are presented in table 1.

Thus, the present invention allows to provide an antidote effect at the level of 23.6%, against 18.8% of the standard.

Claims (1)

A method for protecting vegetative sunflower plants from the damaging effects of 2,4-D, providing for their treatment with an antidote after using the herbicide, characterized in that 3-amino-2- [N- (4-fluorophenyl) carbamido] -4,6 is used as an antidote dimethylthieno [2,3-b] pyridine in an amount of 200 g / ha 5 days after using the herbicide.